I think a lot of that changes with the MCU horror phase. Don’t get me wrong, I’m not one of these folks where the only way a comic can be valuable if there is a movie about it, but A lot of the magazine stuff could come into play with Morbius, blade, etc.
And frankly, given the condition that most of these magazines are in, there’s a “thrill of the hunt” aspect to finding some of these important 70s magazines in good shape. Marvel Preview #3 (1975), Obviously an early Blade appearance, but also features the first appearance of Jamal Afari, the vampire that trained Blade. Not developed in the Tomb of Dracula series, or the Snipes movies.
If the new Blade movies at any point develop how Blade was raised and trained, and include Jamal, this is the book. Last I checked: 1 9.8, 9 9.6s. I just think these magazines are going to be on the radar’s of a lot more folks in the next 18 months or so, but they are already so hard to find in high grade, it might not be worth the effort at that point.